Lesson Planning of MEASUREMENT OF ANGLE WITH PROTRACTOR
Subject Mathematics
Grade 4^{th}
Students` Learning Outcomes
 Draw a right angle using protractor.
 Draw acute and obtuse angles of different measures using protractor.
 Draw an angle using protractor:
 Equal in measure to a given angle,
 Twice the measure of a given angle,
 Equal in measure of the sum of two given angles,
Information for Teachers
 To draw an angle of 50°^{ }first draw a line segment angle will be draw at its one end.
 Then place the protractor so that its zero line matches with your line segment and that the vertex is in correct place. Then put a little mark at the spot showing 50 degrees.
 Take the protractor off and draw a line through your mark till vertex point.
 During this lesson teacher should consult textbook wherein and whenever it is applicable.
Material / Resources
Writing board, chalk/marker, duster, geometry box, pencil, rubber, paper, textbook
Introduction
 Recall the drawing of vertical line by using setsquares.
 Ask any of the students to repeat and then introduce another way of drawing it.
Development
Activity 1

Sum up / Conclusion
 Right angle is of 90°.
 Acute angle is greater than 0° and less than 90°.
 Obtuse angle is between 90° and 180°.
 Protractor is used to draw all angles.
Half or twice of an angle can be draw with protractor.
Assessment
 Ask them to draw 5 angles of their own choice and label them.
 Any student come on board and demonstrates drawing of right angle.
Follow up
 Assign activities from the textbook.
 Draw three acute angles by using protractor and write each step?
 Write the measurement of angles ∠A 0B, ∠A 0C, ∠A0D, ∠A0E, ∠A0F from the following figure.